13C NMR study of the intermolecular interactions in the polyethylene glycol-cellulose acetate-solvent system

As a result of measuring the spin-lattice relaxation rates of¹³C nuclei of polyethylene glycol in different solvents in the presence of cellulose acetates, it was found that polyethylene glycol forms H complexes with cellulose acetate in nonaqueous solvents, and the probability of binding increases with a decrease in the molecular weight of the polyethylene glycol. The formation of H complexes results in an effect of inversion of the mobility of the polyethylene glycol molecules of different weights in concentrated solutions of a mixture of polymers. The value of the effect is determined by the donor-acceptor properties of the solvent and the degree of substitution of hydroxyl groups by acetate groups.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 8, pp. 1766–1768, August, 1989.